单选题 A. if Quantity A is greater; B. if Quantity B is greater; C. if the two quantifies are equal; D. if it is mpossible to determine which quantity is greater. Note: The given information, if any, is always centered above the two quantities. In any question, if a symbolor letter appears more than once, it represents the same thing each time.

单选题

【正确答案】 A

【答案解析】Quantity A is positive and Quantity B is negative. So, Quantity A is greater.

单选题

【正确答案】 C

【答案解析】Quantity A: Since (a⁹)(a⁹) = (a¹⁸), and since a ＞ 0,[*].
Quantity B: (a²)(a³)(a⁴) = a²⁺³⁺⁴ = a⁹.
The quantities are equal.

单选题

【正确答案】 B

【答案解析】Assume that the price of a small pizza is $10; then the price of a large pizza is $10 + 0.30($10) = $10 + $3 = $13. On sale at 30% off, a large pizza costs 30% less than $13. $13 - 0.30($13) = $13 - $3.90 = $9.10 So, Quantity B is $10 and Quantity A is $9.10.

单选题

【正确答案】 A

【答案解析】There is not enough information provided to determine the values of a, b, c, d, e, f, and g; but they are irrelevant. Since the sum of the measures of the seven angles is 360°, their average is 360° + 7 ≈ 51.4°. Quantity A is greater.

单选题

【正确答案】 A

【答案解析】If x represents Katie's age now, then in 9 years she will be x + 9, and so x + 9 = 4x. Therefore, 9 = 3x, and x = 3. So, Katie is now 3 and will be 8 times as old as she is now when she is 24, which will happen in 21 years. Quantity A is greater.

单选题

【正确答案】 B

【答案解析】[*] Quantity A: If h is the height of equilateral triangle ABC, then by the Pythagorean theorem [*] So the area of triangle ABC is [*] Quantity B: [*] The area of isosceles triangle PQR is[*]

单选题

【正确答案】 A

【答案解析】The simplest solution is to notice that if a 1 is chosen first, of the remaining three slips, two of them have -1 on them and one of them has 1 on it. So there are 2 chances in 3 that the second number will be -1 and the product will be -1. Similarly, if a -1 is chosen first, there are 2 chances in 3 that the second number will be 1 and, again, the product will be -1. [*]